chapman



(No Model.) 4 Sheets-Sheet 2.

O. G. PBCK 8: W. H. CHAPMAN.

' DYNAMO ELECTRIC GENERATOR.

No. 276,275. Patented Apr.24, 1883.

Witnesses: Inventors: 4mm Wm. %MAQM.

(No Model.) 4 Sheets-Sheet 3.

G. G. PEOK & W. H. CHAPMAN.

DYNAMO ELECTRIC GENERATOR. No. 276,275. Patented Apr. 24, 1883.

Witnesses: Inventors:

fliforney.

(No Model.) 7 4 Sheets-Sheet 4. O. G. PEGK & W. H. CHAPMAN.

. DYNAMO ELECTRIC GENERATOR.

No. 276,275. Patented A1224, 1883.

nliiIllllllllllllllllllllllllllllfl1? I H r 9 'mtlwsses:

aw WM b M/JWM UNITED STATES PATENT OFFICE.

CHARLES C. PECK AND \VILLIAM II. CHAPMAN, OF MIDDLEBURY, VERMONT.

DYNAMO-ELECTRIC GENERATOR.

SPECIFICATION forming part of Letters Patent No. 276,275, dated April24, 1883,

Application filed August 30, 188-2. (No model.)

To all whom it may concern:

Be it known that we,CHARLES U.PECK and WILLIAM H. CHAPMAN, both ofMiddlebnry, in the county of Addison and State of Vermont, have inventedcertain new and useful Improvements in Electric Generators, of which thefollowing, taken in connection with the accompanying drawings, is aspecification.

Our presentinvention relates to an improvement in electricgenerators,the object of which is to make the generator com pactand to diminish theamount of material needed in the construction of a machine of certaincapacity, or, in other words, to increase the efliciency of a maclnne ofcertain dimensions. We accomplish this by means of a magnet, whosepolepieces turn back toward each other, in combination with twoarmatures, whose ends are expanded inwardly toward each other, ashere-2o inafter described, so that each armature may have an extent ofcontact with the magnetic poles nearly equal to the length of the magnetitsel't'. The magnet may be permanent or electro. If anelectro-magnet,it may be magnetized by a separate current, or by thecurrent of the machine itself. For the purpose of maintaining a steadycurrent two or more sets of armatures and magnets may be used. Theelectro-magnet may be connected into the circuit in multiple are or inseries, as shown.

In the drawings, Figure 1 is an elevationof an electric genera-torembodying our present invention. Fig. 2 is a vertical section of thesame on line z c on Fig. 1. Fig. 3 is a. plan of the armatures and theirconducting-coils. Fig. 4 is a detail showing a modified form of thearmatures. Fig. 5 is a. plan of a generator in which two sets ofarmatures and magnets are employed, and Fi 6 is a sectional eleva- 0tion of a modified form of the magnet.

In Figs. 1 and 2 are shown two soft -iron armatures, A and A, supportedupon and seoured to the bed 13, and provided with the conducting-coils Oand C, respectively.

5 D is a magnet adapted to rock or roll back and forth upon the uppersurface of the armatnres A A, between the coils U and C. It may beeither a permanent or an electro magnet; but in Figs. 1, 2, and 5 it isshown as being an electro-magnet composed of the softiron core E,surrounded by a coil of conductingwire, E, and having secured upon itsends the soft-iron pole-piecesFF. These pole-pieces are shown as beingscrewed upon the short shanks or trunnions a a, projecting from the 5ends of the core E; but they may be fixed in positionin anysuitablemanner. Theyaremade in the form of cups or flanged sleeves accuratelytitted to the ends of the magnetE E, anti extend backward, surroundingthe same to near the middle of its length, but without touching'themagnet, except at its ends. By this construction of the pole-pieces F Fwe secure great compactness of form and greater extent ofcontact-surface, making it nearly equal to 651 the length of the magnetitself, this forming one ot'the principal features of our presentinvention.

The ends or poles of the armatures A A are so formed as to overlap eachother, as shown 7a in Figs. 3 and 4, each armature having its endsbeveled, as shown in Fig. 4, or being provided with one or more V-shapedprojections, which extend between like projections upon the oppositearmature, so that the pole-pieces F F will gradually increase ordiminish the extent of contact as they roll back and forth upon saidarmaturcs, this construction being, however, described and claimed by usin another application of even date herewith. in m Fig. 3 is also shownan improved Form of armature, whereby we are enabled to increase theextent of contact-surface ot' the armatures A A, and at the same timesecure compactness ot form; and it consists in expanding the poles ofsaid armatnrcs by extending them inward toward each other between thecoils (J and G, and making them equal in width to the length of thepole-pieces F F of thcmagnet 1). a

Tlietrunnions (t a are provided at their outer ends with journals, whichhave their hearings in slots I) bin the lower ends of the l'orkedpendent radius-arm G, pivoted at c to a suitable hanger,H. Avibratingmotion isimparted 5 to the radius-arm G by means of theconnecting-rod I, and the crank J, secured upon the driving-shaft K.This driving-shaft has its bearings in the upper ends of two standards,L and L, secured upon the bed B, and is re- [00 volved by means of thedriving-pulleyM and a belt, (not shown,) or in any well-known manner.

A commutator of ordinary construction is employed, it consisting of thetwo bands (I and e,surroundingtheshatt.K,and thethrec springs f, g, andh. The bands d and c are insulated from each other, the band 0 beinginsulated from the shaft K, while the band (I is connected to said shaftby the set-screw t.

Two flat springs,j and 7., are secured, one to each side of the lowerforked end of the radiusarm Gr, said springs being suitably insulatedtherefrom, the lowerend of the spring pressing upon the end of the shortwire I, which projects from the end of the trunnion a, and, passingthrough a hole therein, is connected to the outer end of the coil E,while the lower end of the spring is presses upon the end of the wire m,which projects from the trunnion a, and, passingthrough ahole in saidtrunnion, is connected to the inner end of the coil E.

The outer end of the coil U is connected by wire to to the inner end ofthe coil 0, and the inner end of the coil U is connected to the band (Iby means of the wire 10 standard L, shaft K, and set-screw i, while theouter end of the coil 0 is connected by wire 10 with the spring g. V

The inner end of the coil E is connected by wire at, spring 7t, and wire10 to the springf, while the outer end of said coil is connected by wireI, springj, and wire 20 to one end of the line or circuit, the other endof the circuit being connected by wire 106 with the spring h.

The operation of the machine may be readily understood from theforegoing description, a lid requires no further explanation here.

in Fig. 5 is shown a plan of a machine employing two sets of armaturesand magnets for the purpose of generating a steady current. Thecommutator in this machine is composed of the bandsn, 0, andp,surrounding the shaft K and insulated therefrom and from each other, andthe springs (1,1',S, t, a, r, and to. The inner end of the coil 0 isconnected by wire 10 to the outer end of the coil (2, and the outer endof the coil G is connected by wire 10 to the springq. The inner end ofthe coil 0 is connected by wire 20 to the spring .9, which is alsoconnected by wire 10 to the inner end of the coil the outer end of whichis connected by wire 20 to the inner end of the coil and the outer endof the coil 0 is connected by wire 20 to the spring a. The outer end ofthe coil of the magnet D is connected by wire 20'' to the spring 0',which is also connected by a short wire or otherwise to the spring t.The inner end of the coil of the magnet D is connected by wire to to theouter end of the coil of the magnet 1). The spring to is connected by ashort wire to the springo, which is also connected by wire to to one endof the circuit, the other end of the circuit being connected by wire 10to the inner end of the coil of the magnet D.

A steady current could also be produced with a single set of armaturesand a magnet by using a storage-battery in connection with the machine.This would have the same effect as an air-chamber on a hydraulic pump.

In the magnet illustrated in Fig. 6 the core E is permanently magnetizedand the coil E is dispensed with, as are also the wires 1 and m and thesprings j and 7c, the magnet not requiring to be connected with thecircuit.

What we claim as new, and desire to secure by Letters Patent of theUnited States, is

1. Two soft-iron armatures having their ends constructed and arranged'tooverlap or project by each other and provided with conducting-coils, incombination with an electro' magnet constructed and aranged to rock orroll from one armature to the other in contact therewith, substantiallyas described. v

2. The combination, with two soft-iron armatures provided withconducting-coils, of a magnet composed of a central core, and twosoft-iron pole pieces in the form of cups or flanged sleeves secured tothe ends 01. said core, and surrounding and inclosing a portion of thelength thereof without touching it except at its ends, substantially asdescribed.

3. The combination, with two soft-iron armatures provided withcoiulucting-coils, of an electromagnet composed of a soft-iron core, acoil of conducting-wire surrounding said core, and two pole-pieces inthe form of cups or flanged sleeves secured to said core at its ends,and each surrounding and inclosing a portion of the length of said coreand coil, substantially as and for the purposes described.

4-. The combination of two soft-iron armatures provided withconducting-coils, and having their ends constructed and arranged tooverlap or project by each other, an electromagnet composed of asoft-iron core, a coil of conducting-wire surrounding said core, and twopole-pieces in the form ot'cups or flanged sleeves secured to said coreat its ends, and each surrounding and inclosing a portion of the lengthof said core and coil, substantially as and for the purposes described.

5. In combination with a magnet composed of a central core and twopole-piecesin the form of cups or flanged sleeves, each inclosing aportion of said core without touching its periphery, two soft-ironarmatures provided with conducting-coils, and each having its endsexpanded in 'ardly, substantially as and for the purposes described.

In testimony whereof we have signed our names to this specification, inthe presence of two subscribing witnesses, on this Zlth day of August,A. l). 1882.

CHARLES C. PEUK. WILLIAM I]. CHAPMAN.

Witnesses:

CHARLES E. PINNEY, Gno. M. FLETCHER.

